Are you ready for some American football? First, however, are you ready for some autopsies? The opening of the NFL training camps coincided with the closing of the investigation into the April suicide by gunshot of Ray Easterling, 62, an eight-season NFL safety in the 1970s.

The autopsy found moderately severe chronic traumatic encephalopathy (CTE), progressive damage to the brain associated with repeated blows to the head. CTE was identified as a major cause of Easterling's depression and dementia.

In February 2011, Dave Duerson, 50, an 11-year NFL safety, committed suicide by shooting himself in the chest to spare his brain tissue for research, which has found evidence of CTE. Brain tissue of 20-season linebacker Junior Seau, who was 43 when he killed himself the same way in May, is being studied. The NFL launched a mental health hotline developed and operated with the assistance of specialists in suicide prevention.